Remove skym from sync OWNERS file.

Change-Id: I702a1a074b24961ba22ffed45fb856bd950f8dbc
Reviewed-on: https://chromium-review.googlesource.com/1014372
Commit-Queue: Sky Malice <skym@chromium.org>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551363}

components/sync/OWNERS

 mastiz@chromium.org
 pavely@chromium.org
-skym@chromium.org
 treib@chromium.org
 zea@chromium.org